/Engine/Source/Editor/SequencerCore/Public/MVVM/ViewModels/ViewModelHierarchy.h
Model list for defining logical groupings of children within a view model Custom list types can be registered using RegisterCustomModelListType
namespace UE { namespace Sequencer { enum EViewModelListType { Generic = 1u << 0, Outliner = 1u << 1, TrackArea = 1u << 2, Custom = 1u << 4, Recycled = 1u << 30, Last = 1u << 31, Invalid = Last, Everything = (~0u) & ~(Recycled|Invalid), Any = Everything, } } }